9278991 has 12 divisors (see below), whose sum is σ = 14191632. Its totient is φ = 5822016.

The previous prime is 9278987. The next prime is 9278993. The reversal of 9278991 is 1998729.

9278991 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9278991 - 2² = 9278987 is a prime.

9278991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9278993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30171 + ... + 30476.

It is an arithmetic number, because the mean of its divisors is an integer number (1182636).

Almost surely, 2^9278991 is an apocalyptic number.

9278991 is a deficient number, since it is larger than the sum of its proper divisors (4912641).

9278991 is a wasteful number, since it uses less digits than its factorization.

9278991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60670 (or 60667 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 9278991 is about 3046.1436276052. The cubic root of 9278991 is about 210.1358984309.

Adding to 9278991 its product of digits (81648), we get a palindrome (9360639).

The spelling of 9278991 in words is "nine million, two hundred seventy-eight thousand, nine hundred ninety-one".